stats 10 quiz3

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Feb 20, 2024

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2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 1/8 Quiz 3 Due Jan 21 at 11:59pm Points 10 Questions 10 Available after Jan 21 at 12am Time Limit None Allowed Attempts 2 Instructions Attempt History Attempt Time Score LATEST Attempt 1 30 minutes 10 out of 10 Score for this attempt: 10 out of 10 Submitted Jan 21 at 12:44pm This attempt took 30 minutes. General Quiz Information The purpose of this quiz is to help you check your understanding of Week 3 materials. The quiz is not timed and it's open book/notes. You must complete and submit your answers for each quiz by the due date. Please work on the quiz independently. If you experience a technical problem that interferes with your ability to complete a quiz during the specified time, contact your instructor as soon as possible—you don't have to wait until the quiz has closed Take the Quiz Again 1 / 1 pts Question 1 The following data set shows the number of floors in the tallest buildings in some cities. City # Floors
2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 2/8 A 135 B 115 C 95 D 110 E 125 Which of the given observations is furthest from the mean and therefore contributes most to the standard deviation? City A City B City C Correct! Correct! City D City E 1 / 1 pts Question 2 The salaries of ten randomly selected data scientists are shown below. $209K $123K $119K $118K $119K $242K $135K $196K $113K $187K Find the median for the given sample data. 119K $123K $129K Correct! Correct! $135K
2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 3/8 1 / 1 pts Question 3 The test scores of 17 students are listed below. 52, 56, 60, 62, 66, 71, 73, 80, 82, 83, 86, 88, 90, 92, 92, 94, 97 Find the interquartile range for the sample using the method introduced in class. 24 27 Correct! Correct! 28 40 1 / 1 pts Question 4 The histogram below displays data that were collected on a sample of patients with depression. There are 105 observations in this data set.
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2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 4/8 Which of the following is NOT likely to be true? The mean will be larger than the median. The range of the data is larger than 520. Correct! Correct! At least one potential outlier can be identified using the 1.5(IQR) criterion. The median lies around 160. 1 / 1 pts Question 5 Suppose the distribution of income in the United States is unimodal and strongly right-skewed. Which of the following is true? The median income is smaller than the mean income. Correct! Correct! The median income is equal to the mean income. The median income is larger than the mean income.
2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 5/8 About 50% of the observations are larger than the mean income. 1 / 1 pts Question 6 Below is a data table and a histogram showing the distribution. Choose the most appropriate measure of center and report the typical value (round to the nearest tenth). We should use the mean; the mean is 181.0 We should use the median; the median is 181.0 Correct! Correct! We should use the mean; the mean is 239.9 We should use the median; the median is 239.9 1 / 1 pts Question 7 A sample of students at a college was asked the fastest speed (mpg) they have driven a car.
2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 6/8 The five-number summary for the data is: min = 56, Q1 = 95, Median = 110, Q3 = 120, Max = 156 Is the largest observation in this data set a potential outlier? Yes No Correct! Correct! 1 / 1 pts Question 8 Answer 1: Answer 2: Answer 3: Answer 4: The five-number summary (28, 76, 87, 91 100) summarizes the bar exam passing rates at some law schools in the U.S. Suppose you were asked to construct a boxplot, how would you determine where the whiskers go? The lower whisker extends to the smallest observation that is greater than or equal to 53.5 ; The upper whisker extends to the largest observation that is less than or equal to 113.5 the smallest Correct! Correct! 53.5 Correct! Correct! the largest Correct! Correct!
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2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 7/8 91 orrect Answer orrect Answer 113.5 You Answered You Answered 1 / 1 pts Question 9 Answer the questions using the boxplot below Within which interval would you expect to find the largest number of observations? 5-11 11-14 14-20 20-30 All the intervals above contain approximately equal amount of observations Correct! Correct! 1 / 1 pts Question 10
2/20/22, 12:01 PM Quiz 3: 22W-STATS-10-LEC-4 Introduction to Statistical Reasoning https://bruinlearn.ucla.edu/courses/79251/quizzes/777873 8/8 A research group conducted a study and compared the poverty rates of states in four regions. A boxplot is constructed as below. Which of the following statements is NOT true? Region A has the least amount of variability in poverty rate Region B has the largest amount of variability in poverty rate Correct! Correct! Region C has a outlier state with unusually low poverty rate Region D has the lowest median poverty rate Quiz Score: 10 out of 10

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